You'd have to have a Man Cave. Finished on three sides, open to the shop on the 4th. TV, fridge, couple couches and/or chairs, a pool table, foosball table and dart board.
And a Murphy bed, because some times you get engrossed in a project and need a nap, and sometimes its just good to get away from the Missus for an evening.
If money is no object, one drive-on, one 2-post lift.
A "dirty room," with door: grinders, blast cabinet and small work table in there. Air lines, of course.
A nice, big fab area. Rack for raw materials, big welding/fab table, any shop equipment and/or machine tools, and your tool box. This would be the main work area.
Pallet racks would take up one whole corner, and not just along the outside walls. I'm seeing two shelves coming out into the area. You'll stash good parts, engines, rear ends and stuff on them, and you'll also have all the parts for finished projects.
How tall are the walls/ceiling? A loft or mezzanine would be a great idea.
As stated, a small kitchen-ette. Fridge, microwave, stove/oven (oven for powder coating, stove for chili on game-day), sink to do dishes and counter/cabinets. Finally, you'll need a bathroom. Don't worry about a shower: they sound nice, but I have yet to know anyone who actually uses them. They just collect dust and take up space. You can wash up as much as you need in a sink.
I'd almost say just go with a urinal, and maybe an outhouse or port-a-john out back. You use one a lot more than the other, and a toilet always seems to get really, really nasty in a shop. But that's probably not realistic.
Any unused space you could rent to friends to store boats or cars.
-Brad